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Calculation of Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2019	May 31, 2018	May 31, 2017
Earnings Per Share [Line Items]
Numerator for basic and diluted net income per share - Net income attributable to Neogen					$ 17,545	$ 16,586	$ 17,100	$ 11,914	$ 60,176	$ 63,145	$ 43,793
Denominator for basic net income per share - Weighted average shares									51,888	51,358	50,544
Effect of dilutive stock options									537	791	621
Denominator for diluted net income per share									52,425	52,149	51,165
Net income attributable to Neogen per share:
Basic	$ 0.31	$ 0.25	$ 0.31	$ 0.29	$ 0.34	$ 0.32	$ 0.33	$ 0.23	$ 1.16	$ 1.23	$ 0.87
Diluted	$ 0.30	$ 0.25	$ 0.31	$ 0.29	$ 0.33	$ 0.32	$ 0.33	$ 0.23	$ 1.15	$ 1.21	$ 0.86

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